linux/drivers/net/mdio/mdio-mux-multiplexer.c

// SPDX-License-Identifier: GPL-2.0+
/* MDIO bus multiplexer using kernel multiplexer subsystem
 *
 * Copyright 2019 NXP
 */

#include <linux/mdio-mux.h>
#include <linux/module.h>
#include <linux/mux/consumer.h>
#include <linux/platform_device.h>

struct mdio_mux_multiplexer_state { … };

/**
 * mdio_mux_multiplexer_switch_fn - This function is called by the mdio-mux
 *                                  layer when it thinks the mdio bus
 *                                  multiplexer needs to switch.
 * @current_child:  current value of the mux register.
 * @desired_child: value of the 'reg' property of the target child MDIO node.
 * @data: Private data used by this switch_fn passed to mdio_mux_init function
 *        via mdio_mux_init(.., .., .., .., data, ..).
 *
 * The first time this function is called, current_child == -1.
 * If current_child == desired_child, then the mux is already set to the
 * correct bus.
 */
static int mdio_mux_multiplexer_switch_fn(int current_child, int desired_child,
					  void *data)
{ … }

static int mdio_mux_multiplexer_probe(struct platform_device *pdev)
{ … }

static void mdio_mux_multiplexer_remove(struct platform_device *pdev)
{ … }

static const struct of_device_id mdio_mux_multiplexer_match[] = …;
MODULE_DEVICE_TABLE(of, mdio_mux_multiplexer_match);

static struct platform_driver mdio_mux_multiplexer_driver = …;

module_platform_driver(…) …;

MODULE_DESCRIPTION(…) …;
MODULE_AUTHOR(…) …;
MODULE_LICENSE(…) …;